Distribution of EBV/IgA/VCA antibodies in the serum of each group.
| Group | n | No. of cases with IgA/VCA antibody titer (≥ 1:10) | Positives (%) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Negative | 10 | 20 | 40 | 80 | 160 | 320 | 640 | |||
| NPC | 317 | 9 | 51 | 33 | 71 | 68 | 49 | 25 | 11 | 308 (97.2) |
| Spouse | 317 | 272 | 28 | 11 | 5 | 0 | 1 | 0 | 0 | 45 (14.2) |
| Child | 317 | 254 | 56 | 5 | 1 | 1 | 0 | 0 | 0 | 63 (19.9) |
| Control | 413 | 400 | 11 | 1 | 1 | 0 | 0 | 0 | 0 | 13 (3.1) |